tests: databases: Add a simple test for MySQL.

Previously, the activation phase for this service caused some systems using it
to not boot. This test checks that it's possible to boot a system using it,
and at least start the service.

* gnu/tests/databases.scm (%mysql-os, %test-mysql): New variables.
  (run-mysql-test): New procedure.

Merge branch 'master' into staging

services: Add MongoDB.

* gnu/services/databases.scm (%default-mongodb-configuration-file,
  %mongodb-accounts, mongodb-service-type): New variables.
  (<mongodb-configuration>): New record type.
  (mongodb-activation, mongodb-shepherd-service): New procedures.
* gnu/tests/databases.scm (%test-mongodb): New variable.
* doc/guix.texi (Database Services): Add MongoDB documentation.

Merge branch 'master' into staging

gnu: services: Add cgit.

* gnu/services/version-control.scm
(<cgit-configuration-file>, <cgit-configuration>): New record types.
(cgit-configuration-robots-string, cgit-activation,
cgit-configuration-nginx-config): New procedures.
(%cgit-configuration-nginx, cgit-service-type): New variables.
* gnu/tests/version-control.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Version Control): Document the cgit service.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

Merge branch 'master' into staging

tests: install: Switch to modifying the gc-root-service-type.

Fixes <https://bugs.gnu.org/28600>.
Fixes a regression introduced in
4e854b1814a9216ae7cc90aef4d82fd989a519c3.
Reported by Christopher Baines <mail@cbaines.net>.

* gnu/tests/install.scm (operating-system-with-gc-roots): Use
'simple-service' to extend GC-ROOT-SERVICE-TYPE instead of instantiating
it.

tests: mcron: Adjust use of 'wait-for-file'.

Fixes a regression introduced in
8bd5231485cdeb02078c4294badb3a1e7caa0fe0, whereby returning #<eof> would
no longer work (since #<eof> would be in the cdr of the result, and thus
it would not get converted to a string.)

* gnu/tests/base.scm (run-mcron-test)["root's job with command"]: Pass
  #:read to 'wait-for-file'.

Merge branch 'master' into staging

gnu: Add rsync service.

* doc/guix.texi (Networking Services): Add rsync service documentation.
* gnu/services/rsync.scm (<rsync-configuration>): New file.
* gnu/tests/rsync.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new files.

Signed-off-by: Christopher Baines <mail@cbaines.net>

Merge branch 'master' into staging

tests: Fix incorrect use of 'file-append'.

Fixes a regression introduced in fbc7b1f12561159e0ec3f6459d336f95cf2ce503.

* gnu/tests/install.scm (run-install)[install]: Don't use 'file-append'
with a string as its first argument; use a gexp with 'string-append' instead.
Use a gexp instead of a list for "-cdrom IMG".

gnu: elogind: Use itself as the cgroup controller.

Fixes a regression introduced in
fa67d5654176b4b815832eaf259188e1486c65ab whereby elogind would fail to
start with:

  Cannot determine cgroup we are running in: No data available
  Out of memory.

thereby preventing log-in altogether.

* gnu/packages/freedesktop.scm (elogind)[arguments]: Pass
"--with-cgroup-controller=elogind".
* gnu/tests/desktop.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

marionette: 'wait-for-file' can be passed a read procedure.

* gnu/build/marionette.scm (wait-for-file): Add #:read parameter and
honor it.
* gnu/tests/base.scm (run-basic-test)["login on tty1"]: Use
'wait-for-file' instead of inline code.

tests: Add test for installing from an ISO Image.

* gnu/tests/install.scm (%test-iso-image-installer): New variable.
  (run-install): Add #:installation-disk-image-file-system-type as a keyword
  argument.

Merge branch 'master' into staging

services: user-processes: Reap child processes.

Fixes <http://bugs.gnu.org/26931>.
Reported by Leo Famulari <leo@famulari.name>.

* gnu/services/base.scm (user-processes-service-type)[stop]: Add
'reap-children' loop.
* gnu/tests/base.scm (run-halt-test): New procedure.
(%test-halt): New variable.

Merge branch 'master' into staging

Merge branch 'core-updates'

gnu: bootloader: Deprecate "device" field in favor of "target".

* gnu/bootloader.scm (<bootloader-configuration>): Deprecate "device" field in
favor of "target" field.  This is mostly a renaming but also a generalization
to support UEFI targets being paths to a mounted partition instead of a device
name.
* gnu/system/examples/bare-bones.tmpl:
* gnu/system/examples/desktop.tmpl:
* gnu/system/examples/lightweight-desktop.tmpl:
* gnu/system/examples/vm-image.tmpl:
* gnu/system/install.scm:
* gnu/tests.scm:
* gnu/tests/install.scm:
* gnu/tests/nfs.scm:
* tests/system.scm: Adapt all invocations of bootloader-configuration.
* guix/scripts/system.scm (perform-action): Rename device argument to
bootloader-target.
(process-action): Adapt caller.
* doc/guix.texi (Proceeding with the Installation):
* doc/guix.texi (Bootloader Configuration): Update documentation.